what null modem cable to use for B2600?

I've recently acquired a B2600 in a garage-sale. The seller was selling lots of stuff acquired from a company gone broke, and clearly didn't know what he had ('But what can you do with this thing?').

It seems in good order, according to the little lcd-screen on the front
it boots fine, eventually showing a hearbeat.
This screen also informs me the console is SER_1, which I take it is the
first serial port. A monitor gets a sync signal (about 80 KHz) but no display. I have no usb keyboard here, so I can't test that.

I know how a serial console should work (plug in the cable, start minicom
with 9600 8N1 settings, and off you go). Unfortunately, this doesn't work,
possibly due to my ill luck with rs232 cables. I've got a long history if not working rs232 cables.

If I look at
http://www.lammertbies.nl/comm/info/nl_RS-232_null_modem.html
(in Dutch, unfortunately for you) I see different types of null-modem cables.

- no handshaking, 3 wires
- loopback handshaking, 3 wires
- partial handshaking, 7 wires
- full handshaking, 7 wires

What cable would be advisable? I'm really looking forward to getting linux
running on this thing - it's a lot more acceptable noise-wise than the old
C200 I used to have, even if it has 4 fans on the front, one on the cpu and
one in the powersupply.

Thanks,
Jurriaan
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